Research output: Contribution to journal › Article › peer-review
Origin of poor photovoltaic performance of bis(tetracyanoantrathiophene) non-fullerene acceptor. / Kobeleva, E. S.; Popov, A. A.; Baranov, D. S. et al.
In: Chemical Physics, Vol. 546, 111162, 01.06.2021.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Origin of poor photovoltaic performance of bis(tetracyanoantrathiophene) non-fullerene acceptor
AU - Kobeleva, E. S.
AU - Popov, A. A.
AU - Baranov, D. S.
AU - Uvarov, M. N.
AU - Nevostruev, D. A.
AU - Degtyarenko, K. M.
AU - Gadirov, R. M.
AU - Sukhikh, A. S.
AU - Kulik, L. V.
N1 - Funding Information: This work was supported by RFBR grants № 19-03-00149a and № 20-33-70126 and by state assignment to Voevodsky Institute of Chemical Kinetics and Combustion SB RAS, number AAAA-A21-121011390038-1. Publisher Copyright: © 2021 Elsevier B.V. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2021/6/1
Y1 - 2021/6/1
N2 - Light-induced EPR and out-of-phase electron spin echo techniques were applied to identify the origin of low photovoltaic performance of novel non-fullerene antrathiophene-based acceptor 2,2′-[2,2′-(9,9-dioctyl-9H-fluorene-2,7-diyl)bis(anthra[2,3-b]thiophene-5,10-diylidene)]tetrapropanedinitrile (AT1), compared to conventional fullerene acceptors. These techniques revealed that average trapping energy of electrons in PCDTBT/AT1 blend is higher than that in the blends of PCDTBT with fullerene acceptors, while the distance of the initial photo-induced electron transfer is decreased. These two effects are suggested to enhance the efficiency of geminate recombination in PCDTBT/AT1 blend and reduce the yield of free charges, which is supposed to be the main reason for poor OPV performance of AT1-containing blends. Low electron mobility μe = 3.5 *10-6 cm2V-1s−1 is estimated for AT1 from photo-CELIV experiment. Strong localization of the electrons on terminal acceptor units of AT1 consistently explains both efficient geminate recombination in blends of antrathiophene-based acceptor with polymer donors and low electron mobility in AT1.
AB - Light-induced EPR and out-of-phase electron spin echo techniques were applied to identify the origin of low photovoltaic performance of novel non-fullerene antrathiophene-based acceptor 2,2′-[2,2′-(9,9-dioctyl-9H-fluorene-2,7-diyl)bis(anthra[2,3-b]thiophene-5,10-diylidene)]tetrapropanedinitrile (AT1), compared to conventional fullerene acceptors. These techniques revealed that average trapping energy of electrons in PCDTBT/AT1 blend is higher than that in the blends of PCDTBT with fullerene acceptors, while the distance of the initial photo-induced electron transfer is decreased. These two effects are suggested to enhance the efficiency of geminate recombination in PCDTBT/AT1 blend and reduce the yield of free charges, which is supposed to be the main reason for poor OPV performance of AT1-containing blends. Low electron mobility μe = 3.5 *10-6 cm2V-1s−1 is estimated for AT1 from photo-CELIV experiment. Strong localization of the electrons on terminal acceptor units of AT1 consistently explains both efficient geminate recombination in blends of antrathiophene-based acceptor with polymer donors and low electron mobility in AT1.
KW - Electron spin echo
KW - EPR spectroscopy
KW - Fullerenes
KW - Mobility
KW - Organic photovoltaics
KW - Recombination
UR - http://www.scopus.com/inward/record.url?scp=85102567808&partnerID=8YFLogxK
U2 - 10.1016/j.chemphys.2021.111162
DO - 10.1016/j.chemphys.2021.111162
M3 - Article
AN - SCOPUS:85102567808
VL - 546
JO - Chemical Physics
JF - Chemical Physics
SN - 0301-0104
M1 - 111162
ER -
ID: 28090136